Unit 83

Santai Minda

Pastikan bentangan mempunyai semua permukaan yang diperlukan untuk membina bentuk 3D sasaran.

Langkah 1

Pilih bentangan yang sepadan

Pastikan bentangan mempunyai semua permukaan yang diperlukan untuk membina bentuk 3D sasaran.

bentangan → semua permukaan

bentangan → semua permukaan = 展开图 → 所有的面
做立体模型前，先选对展开图：它必须有目标形状需要的每一个面。先数目标形状的面数，再数展开图的块数，两者要相等。
例子：正方体要6个正方形，若展开图只有5块，6 − 5 = 1，还缺1个面。
注意：块数对了还要看形状，长方体的长方形要成对一样大。

bentangan → semua permukaan = net → all the faces
Before building, choose a net that has every face the target shape needs. Count the faces of the shape, then count the parts of the net; the two numbers must be equal.
Example: A cube needs 6 squares. A net with only 5 squares leaves 6 − 5 = 1 face missing.
Watch out: The right count is not enough; for a cuboid, the rectangles must also come in matching pairs.

Langkah 2

Potong, lipat dan cantum

Potong di garisan luar, lipat pada garisan sambungan dan cantumkan tepi dengan kemas serta selamat.

potong → lipat → cantum

potong → lipat → cantum = 剪 → 折 → 粘
先沿外框实线剪下，再沿面与面之间的接线折，最后把边粘好。顺序不能乱，先粘就折不了。用剪刀时刀尖朝外。
例子：三角锥展开图有4个三角形，接线有4 − 1 = 3条，所以要折3次。
注意：只剪外线，剪到中间的折线，面就会掉下来。

potong → lipat → cantum = cut → fold → join
Cut along the outer solid line, fold along the lines between faces, then glue the edges neatly. The order matters: you cannot fold after gluing. Keep scissor tips pointing away from you.
Example: A triangular pyramid net has 4 triangles joined by 4 − 1 = 3 fold lines, so you fold 3 times.
Watch out: Cut only the outer line; cutting a fold line makes a face fall off.

Langkah 3

Hias dan semak objek

Selepas menghias, semak bahawa semua permukaan bercantum, objek stabil dan bentuknya sepadan dengan rancangan.

hias · cantum · stabil

hias · cantum · stabil = 装饰 · 粘合 · 稳固
装饰完后检查三件事：每条边都粘好、模型放在桌上不会倒、形状和原来的计划一样。三样都做到，模型才算完成。
例子：正方体有12条边，展开图折出其中5条，其余12 − 5 = 7条要粘，逐条检查。
注意：装饰贴太多、胶水太多，会压弯面，形状就走样。

hias · cantum · stabil = decorate · joined · steady
After decorating, check three things: every edge is joined, the model stands without falling, and the shape matches your plan.
Example: A cube has 12 edges. The net folds 5 of them, so 12 − 5 = 7 edges must be glued. Check all 7.
Watch out: Heavy decorations or too much glue can bend a face and spoil the shape.

Semak cepat · Soalan 1 / 2

Cuba sendiri

Pilih jawapan. Jika belum tepat, baca petunjuk dan cuba lagi.

Sebelum memotong, bentangan perlu mempunyai…

bentangan · sebelum memotong = 展开图 · 剪之前
题目问剪下展开图之前，要先确认什么。想一想：模型要围得起来，展开图最重要的条件是什么？逐个选项问自己，这样做出来的模型会不会有缺口。
例子：四角锥要1 + 4 = 5个面，展开图要数到5块才行。
注意：先检查再剪，剪坏的纸很难补回去。

bentangan · sebelum memotong = net · before cutting
The question asks what to check on a net before you cut it. Ask of each choice: would the finished model close up with no gaps?
Example: A square pyramid needs 1 + 4 = 5 faces, so its net must have 5 parts.
Watch out: Check first, then cut; paper that is cut wrongly is hard to fix.

Semak cepat · Soalan 2 / 2

Cuba sendiri

Pilih jawapan. Jika belum tepat, baca petunjuk dan cuba lagi.

Urutan membina objek 3D yang betul ialah…

urutan = 顺序
题目问做立体模型时步骤的正确顺序。想象真的动手做：拿到纸后第一步做什么，最后一步做什么。把每个选项的步骤读一遍，看照着做能不能完成模型。
例子：三角柱有2个三角形和3个长方形，2 + 3 = 5个面。
注意：只要有一步颠倒，后面的步骤就做不下去。

urutan = order
The question asks for the right order of steps when building a 3D model. Picture doing it with real paper: what comes first and what comes last? Read each choice as a set of actions and ask if it would give a finished model.
Example: A triangular prism uses 2 triangles and 3 rectangles: 2 + 3 = 5 faces.
Watch out: If one step comes too early, the next step becomes impossible.

Ringkasan

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Ingat: pilih bentangan yang sepadan; potong, lipat dan cantum; hias dan semak objek.

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